Answer:
The way he writes isn't as modern as today's way of speaking so most people have struggle understanding because they grew up speaking modern terms.
Explanation:
You didn’t put a question? Unless you just want to put like a fact or something down
It depends on what adaptations you're looking at but I'd say some significant differences across the board are the portrayals of the monster. In the books, the monster can speak eloquently and read as well while he mostly grunts and struggles with words in the movie adaptations.